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  Method of manufacturing line of autohesion threadUSPTO Application #: 20060174536Title: Method of manufacturing line of autohesion thread Abstract: An object of the present invention is to provide a method of manufacturing autohesion thread such that a smooth surface is offered, the cutting thereof is easy, filaments composing thread are not frayed in cutting, and additionally drainability are superior, and then plural kinds of filaments can be combined. The invention provides a method of manufacturing a line of fusion thread characterized in that plural filaments comprising thermoplastic resin are paralleled, twisted and/or braided if desired, and subsequently drawn under heating at a draw ratio of less than 1.0 to thereby substantially fuse the adjacent filaments to be subsequently drawn under heating at a draw ratio of more than 1.0. (end of abstract) Agent: Wenderoth, Lind & Ponack, L.L.P. - Washington, DC, US Inventor: Shigeru Nakanishi USPTO Applicaton #: 20060174536 - Class: 043044980 (USPTO) Related Patent Categories: Fishing, Trapping, And Vermin Destroying, Fishing, Lines And/or Leaders The Patent Description & Claims data below is from USPTO Patent Application 20060174536. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of manufacturing a line of autohesion thread in which adjacent filaments are substantially fused together. [0003] 2. Background Art [0004] Fishing lines for leisure and fishery, materials for fisheries such as a long line of tuna fishery, and threads to be employed for rope, gut or kite string are roughly divided mainly into monofilament yarn and braided yarn such that plural monofilaments are braided. [0005] Monofilament yarn has low frictional resistance in rubbing against other matters by reason of having a smoother surface than braided yarn. For example, in the case of using monofilament yarn as a fishing line, frictional resistance caused by the rubbing of a fishing line and a guide in throwing in a fishing line is so low that a bait can be thrown exactly to a long distance. Monofilament yarn is also superior in drainability by reason of holding no water inside. In addition, braided yarn is cut with difficulty, and when the yarn is cut, the yarn in a cut portion is split and the cut portion becomes feathery, so that the handling is difficult; however, monofilament yarn also has an advantage in that it has no such problem. However, for example, in the case where resin composing the yarn is ultra high molecular weight polyethylene or fully aromatic polyamide, it is necessary to use a solvent in spinning and remove the solvent after spinning, which is a problem that it is difficult to manufacture a monofilament having a certain thickness or more, which is appropriate for uses such as a fishing line, rope or gut as described above. [0006] On the other hand, braided yarn can be made into a line of thread having thickness appropriate for uses as described above irrespective of the kind of resin as a raw material by reason of employing plural monofilaments or a multifilament. In addition, braided yarn has such an advantage that it is possible to combine plural kinds of filaments, and as a result, an effect such as adjustment of desired specific gravity, which is not obtained in a single filament, can be attained. In monofilament yarn, it is naturally impossible to combine plural kinds of filaments. [0007] JP-A-9-98698 reports a method of manufacturing a fishing line in such a manner that plural filaments of polyolefin are braided or twisted, and thereafter exposed to a temperature in the melting range of polyolefin while drawn at a draw ratio of 1.0 or more to thereby fuse adjacent filaments. The inventors of the present invention, however, have found out that it is practically difficult to substantially fuse adjacent filaments in the above-mentioned fishing line by such a method, and accordingly that the application of physical force by use to the fishing line thus manufactured disjoints the bond of fiber by reason of not being actually substantially fused to be incapable of achieving the original object of making a pseudo monofilament by fusing, that is, the problem is that the application of physical force by use causes the fishing line to have no differences with ordinary braided yarn. Further, the inventors of the present invention have found out a defect such that heat treatment in such a method decreases the strength of the fishing line, which thus cannot but be drawn in order to compensate for the decreased strength, and consequently the drawing compensates for the strength, while the fishing line becomes greatly thinner to the extent of the thickness of approximately 60% or less compared to the thickness of the fishing line before the treatment, thereby to deteriorate wear resistance. [0008] The inventors of the present invention have earnestly studied a yarn having both of the above-mentioned advantage of monofilament yarn and the advantage of braided yarn to develop a line of thread in which plural filament yarn of high strength fiber are integrated by using low-temperature thermal adhesion resin having a lower melting point than the melting point of the above-mentioned filament yarn (JP-A-2002-54041). As a result of extensive studies, they have also developed a line of thread in which low-temperature thermal adhesion resin is replaced with a hot melt adhesive (JP-A-2003-116431). SUMMARY OF THE INVENTION [0009] The present invention is intended to provide a method of manufacturing a line of fusion thread having both of the advantages of monofilament yarn and of braided yarn, such that a smooth surface is offered, the cutting thereof is easy, filaments composed of the line of thread are not frayed in cutting, and additionally drainability and durability such that the application of physical force by use does not disjoint the bond of fiber are superior, and then plural kinds of filaments can be combined. [0010] Through intensive studies for achieving the above-mentioned object, the inventors of the present invention have obtained unexpected finding such that plural filaments comprising a thermoplastic resin are paralleled, twisted and/or braided if desired, and subsequently drawn under heating at a draw ratio of less than 1.0, thereby substantially fusing the adjacent filaments completely without a fusing medium. The inventors of the present invention have found that the drawing under heating at a draw ratio of less than 1.0 allows a line of fusion thread obtained by hot drawing treatment to become thicker as compared with the line before the treatment, whereby the above-mentioned problem in publicly known art is solved. Substantially complete fusing of adjacent filaments in this manner allows a new line of thread having the following advantages, which does not belong to monofilament yarn nor braided yarn. That is to say, a line of fusion thread of the present invention has a smooth surface and is also superior in drainability by reason of holding no water inside. In addition, the above-mentioned line of thread is easily cut and component filaments are not frayed not merely in cutting but also in long-term use. Thus, resin composed of a filament is not limited to a single kind while having the advantage of monofilament yarn, and a combination of filaments of two different kinds or more may perform characteristics of each of the filaments. The most preferable resin to be used, however, is a high strength filament such as an ultra high molecular weight polyethylene filament. [0011] The inventors of the present invention have completed the present invention through further studies. [0012] That is to say, the present invention relates to: [0013] (1) a method of manufacturing a line of fusion thread characterized in that plural filaments comprising a thermoplastic resin are paralleled, twisted and/or braided if desired, and subsequently drawn under heating at a draw ratio of less than 1.0 to substantially fuse the adjacent filaments and thereafter drawn under heating at a draw ratio of more than 1.0, [0014] (2) the method of manufacturing a line of fusion thread according to the above (1), wherein the thermoplastic resin is a polyamide resin, a polyester resin, a fluororesin or a polyolefin resin, [0015] (3) the method of manufacturing a line of fusion thread according to the above (1), characterized in that the filaments comprising a thermoplastic resin are filaments having a tensile strength of 20 g/d or more, [0016] (4) the method of manufacturing a line of fusion thread according to any one of the above (1) to (3), wherein the temperature for the drawning under heating at a draw ratio of less than 1.0 is higher than the melting point of the filaments comprising a thermoplastic resin, [0017] (5) the method of manufacturing a line of fusion thread according to any one of the above (1) to (4), wherein the outer periphery of the thread is further coated with a synthetic resin after the heat drawing at a draw ratio of more than 1.0, [0018] (6) a method of manufacturing a line of fusion thread characterized in that plural filaments comprising a thermoplastic resin are paralleled so as to surround a core string and further twisted if desired, or plural filaments comprising a thermoplastic resin are braided around a core string, and subsequently drawn under heating at a draw ratio of less than 1.0 to thereby substantially fuse the adjacent filaments to be subsequently drawn under heating at a draw ratio of more than 1.0 if desired, [0019] (7) a method of substantially fusing adjacent filaments characterized in that the plural filaments comprising a thermoplastic resin are paralleled, twisted and/or braided if desired, and subsequently drawn under heating at a draw ratio of less than 1.0, [0020] (8) a line of fusion thread characterized by being manufactured by a method according to any one of the above (1) to (7), [0021] (9) a line of fusion thread characterized by containing plural filaments comprising a thermoplastic resin and not containing a fusing medium, wherein the adjacent filaments are substantially fused together, and [0022] (10) the line of fusion thread according to the above (9), containing plural filaments comprising a thermoplastic resin wherein the adjacent filaments are substantially fused, characterized in that the thickness of said line of thread is within a .+-.10% range of that of a line of thread containing filaments of the same thermoplastic resin wherein the number of the filaments is the same as said line of thread and the adjacent filaments are not fused; and that the tensile strength of said line of thread is more than that of the line of unfused thread. 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